I'm not going to continue repeat the arguments which have been made exhaustively about the benefits vs. draw backs of these approaches by other people. There are plenty of articles which cover this topic... all I can say is please read them.

If you still don't see any value in these tools, don't use them.

All I'll say is this:

In my experience, people tend to consider their applications to be simple enough that a simple solution is sufficient.

However, in reality, that seldom seems to be the case.

UI is hard to get right, and has a tendency to drift towards complexity over time as more features are added: I can think of several people who have picked the naive simple solution and regretted it later; to the point of rewrite in some cases.

People who picked the complicated solution sometimes regretted the extra burden of complexity, but I don't think I've ever seen this as a cause for large scale failure or rewrite.